6 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; only
11 * version 2.1 of the License.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * Mimic system calls for:
24 * - session creation, returns a file descriptor or failure.
25 * - channel creation, returns a file descriptor or failure.
26 * - Operates on a session file descriptor
27 * - Takes all channel options as parameters.
28 * - stream get, returns a file descriptor or failure.
29 * - Operates on a channel file descriptor.
30 * - stream notifier get, returns a file descriptor or failure.
31 * - Operates on a channel file descriptor.
32 * - event creation, returns a file descriptor or failure.
33 * - Operates on a channel file descriptor
34 * - Takes an event name as parameter
35 * - Takes an instrumentation source as parameter
36 * - e.g. tracepoints, dynamic_probes...
37 * - Takes instrumentation source specific arguments.
40 #include <linux/module.h>
41 #include <linux/proc_fs.h>
42 #include <linux/anon_inodes.h>
43 #include <linux/file.h>
44 #include <linux/uaccess.h>
45 #include <linux/slab.h>
46 #include <linux/err.h>
47 #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_all() */
48 #include <wrapper/ringbuffer/vfs.h>
49 #include <wrapper/ringbuffer/backend.h>
50 #include <wrapper/ringbuffer/frontend.h>
51 #include <wrapper/poll.h>
52 #include <wrapper/file.h>
53 #include <wrapper/kref.h>
54 #include <lttng-string-utils.h>
55 #include <lttng-abi.h>
56 #include <lttng-abi-old.h>
57 #include <lttng-events.h>
58 #include <lttng-tracer.h>
59 #include <lttng-tp-mempool.h>
60 #include <lib/ringbuffer/frontend_types.h>
63 * This is LTTng's own personal way to create a system call as an external
64 * module. We use ioctl() on /proc/lttng.
67 static struct proc_dir_entry
*lttng_proc_dentry
;
68 static const struct file_operations lttng_fops
;
69 static const struct file_operations lttng_session_fops
;
70 static const struct file_operations lttng_channel_fops
;
71 static const struct file_operations lttng_metadata_fops
;
72 static const struct file_operations lttng_event_fops
;
73 static struct file_operations lttng_stream_ring_buffer_file_operations
;
75 static int put_u64(uint64_t val
, unsigned long arg
);
78 * Teardown management: opened file descriptors keep a refcount on the module,
79 * so it can only exit when all file descriptors are closed.
83 int lttng_abi_create_session(void)
85 struct lttng_session
*session
;
86 struct file
*session_file
;
89 session
= lttng_session_create();
92 session_fd
= lttng_get_unused_fd();
97 session_file
= anon_inode_getfile("[lttng_session]",
100 if (IS_ERR(session_file
)) {
101 ret
= PTR_ERR(session_file
);
104 session
->file
= session_file
;
105 fd_install(session_fd
, session_file
);
109 put_unused_fd(session_fd
);
111 lttng_session_destroy(session
);
116 int lttng_abi_tracepoint_list(void)
118 struct file
*tracepoint_list_file
;
121 file_fd
= lttng_get_unused_fd();
127 tracepoint_list_file
= anon_inode_getfile("[lttng_tracepoint_list]",
128 <tng_tracepoint_list_fops
,
130 if (IS_ERR(tracepoint_list_file
)) {
131 ret
= PTR_ERR(tracepoint_list_file
);
134 ret
= lttng_tracepoint_list_fops
.open(NULL
, tracepoint_list_file
);
137 fd_install(file_fd
, tracepoint_list_file
);
141 fput(tracepoint_list_file
);
143 put_unused_fd(file_fd
);
148 #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS
150 int lttng_abi_syscall_list(void)
156 int lttng_abi_syscall_list(void)
158 struct file
*syscall_list_file
;
161 file_fd
= lttng_get_unused_fd();
167 syscall_list_file
= anon_inode_getfile("[lttng_syscall_list]",
168 <tng_syscall_list_fops
,
170 if (IS_ERR(syscall_list_file
)) {
171 ret
= PTR_ERR(syscall_list_file
);
174 ret
= lttng_syscall_list_fops
.open(NULL
, syscall_list_file
);
177 fd_install(file_fd
, syscall_list_file
);
181 fput(syscall_list_file
);
183 put_unused_fd(file_fd
);
190 void lttng_abi_tracer_version(struct lttng_kernel_tracer_version
*v
)
192 v
->major
= LTTNG_MODULES_MAJOR_VERSION
;
193 v
->minor
= LTTNG_MODULES_MINOR_VERSION
;
194 v
->patchlevel
= LTTNG_MODULES_PATCHLEVEL_VERSION
;
198 void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version
*v
)
200 v
->major
= LTTNG_MODULES_ABI_MAJOR_VERSION
;
201 v
->minor
= LTTNG_MODULES_ABI_MINOR_VERSION
;
205 long lttng_abi_add_context(struct file
*file
,
206 struct lttng_kernel_context
*context_param
,
207 struct lttng_ctx
**ctx
, struct lttng_session
*session
)
210 if (session
->been_active
)
213 switch (context_param
->ctx
) {
214 case LTTNG_KERNEL_CONTEXT_PID
:
215 return lttng_add_pid_to_ctx(ctx
);
216 case LTTNG_KERNEL_CONTEXT_PRIO
:
217 return lttng_add_prio_to_ctx(ctx
);
218 case LTTNG_KERNEL_CONTEXT_NICE
:
219 return lttng_add_nice_to_ctx(ctx
);
220 case LTTNG_KERNEL_CONTEXT_VPID
:
221 return lttng_add_vpid_to_ctx(ctx
);
222 case LTTNG_KERNEL_CONTEXT_TID
:
223 return lttng_add_tid_to_ctx(ctx
);
224 case LTTNG_KERNEL_CONTEXT_VTID
:
225 return lttng_add_vtid_to_ctx(ctx
);
226 case LTTNG_KERNEL_CONTEXT_PPID
:
227 return lttng_add_ppid_to_ctx(ctx
);
228 case LTTNG_KERNEL_CONTEXT_VPPID
:
229 return lttng_add_vppid_to_ctx(ctx
);
230 case LTTNG_KERNEL_CONTEXT_PERF_COUNTER
:
231 context_param
->u
.perf_counter
.name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
232 return lttng_add_perf_counter_to_ctx(context_param
->u
.perf_counter
.type
,
233 context_param
->u
.perf_counter
.config
,
234 context_param
->u
.perf_counter
.name
,
236 case LTTNG_KERNEL_CONTEXT_PROCNAME
:
237 return lttng_add_procname_to_ctx(ctx
);
238 case LTTNG_KERNEL_CONTEXT_HOSTNAME
:
239 return lttng_add_hostname_to_ctx(ctx
);
240 case LTTNG_KERNEL_CONTEXT_CPU_ID
:
241 return lttng_add_cpu_id_to_ctx(ctx
);
242 case LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE
:
243 return lttng_add_interruptible_to_ctx(ctx
);
244 case LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE
:
245 return lttng_add_need_reschedule_to_ctx(ctx
);
246 case LTTNG_KERNEL_CONTEXT_PREEMPTIBLE
:
247 return lttng_add_preemptible_to_ctx(ctx
);
248 case LTTNG_KERNEL_CONTEXT_MIGRATABLE
:
249 return lttng_add_migratable_to_ctx(ctx
);
250 case LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL
:
251 case LTTNG_KERNEL_CONTEXT_CALLSTACK_USER
:
252 return lttng_add_callstack_to_ctx(ctx
, context_param
->ctx
);
259 * lttng_ioctl - lttng syscall through ioctl
265 * This ioctl implements lttng commands:
266 * LTTNG_KERNEL_SESSION
267 * Returns a LTTng trace session file descriptor
268 * LTTNG_KERNEL_TRACER_VERSION
269 * Returns the LTTng kernel tracer version
270 * LTTNG_KERNEL_TRACEPOINT_LIST
271 * Returns a file descriptor listing available tracepoints
272 * LTTNG_KERNEL_WAIT_QUIESCENT
273 * Returns after all previously running probes have completed
274 * LTTNG_KERNEL_TRACER_ABI_VERSION
275 * Returns the LTTng kernel tracer ABI version
277 * The returned session will be deleted when its file descriptor is closed.
280 long lttng_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
283 case LTTNG_KERNEL_OLD_SESSION
:
284 case LTTNG_KERNEL_SESSION
:
285 return lttng_abi_create_session();
286 case LTTNG_KERNEL_OLD_TRACER_VERSION
:
288 struct lttng_kernel_tracer_version v
;
289 struct lttng_kernel_old_tracer_version oldv
;
290 struct lttng_kernel_old_tracer_version
*uversion
=
291 (struct lttng_kernel_old_tracer_version __user
*) arg
;
293 lttng_abi_tracer_version(&v
);
294 oldv
.major
= v
.major
;
295 oldv
.minor
= v
.minor
;
296 oldv
.patchlevel
= v
.patchlevel
;
298 if (copy_to_user(uversion
, &oldv
, sizeof(oldv
)))
302 case LTTNG_KERNEL_TRACER_VERSION
:
304 struct lttng_kernel_tracer_version version
;
305 struct lttng_kernel_tracer_version
*uversion
=
306 (struct lttng_kernel_tracer_version __user
*) arg
;
308 lttng_abi_tracer_version(&version
);
310 if (copy_to_user(uversion
, &version
, sizeof(version
)))
314 case LTTNG_KERNEL_TRACER_ABI_VERSION
:
316 struct lttng_kernel_tracer_abi_version version
;
317 struct lttng_kernel_tracer_abi_version
*uversion
=
318 (struct lttng_kernel_tracer_abi_version __user
*) arg
;
320 lttng_abi_tracer_abi_version(&version
);
322 if (copy_to_user(uversion
, &version
, sizeof(version
)))
326 case LTTNG_KERNEL_OLD_TRACEPOINT_LIST
:
327 case LTTNG_KERNEL_TRACEPOINT_LIST
:
328 return lttng_abi_tracepoint_list();
329 case LTTNG_KERNEL_SYSCALL_LIST
:
330 return lttng_abi_syscall_list();
331 case LTTNG_KERNEL_OLD_WAIT_QUIESCENT
:
332 case LTTNG_KERNEL_WAIT_QUIESCENT
:
335 case LTTNG_KERNEL_OLD_CALIBRATE
:
337 struct lttng_kernel_old_calibrate __user
*ucalibrate
=
338 (struct lttng_kernel_old_calibrate __user
*) arg
;
339 struct lttng_kernel_old_calibrate old_calibrate
;
340 struct lttng_kernel_calibrate calibrate
;
343 if (copy_from_user(&old_calibrate
, ucalibrate
, sizeof(old_calibrate
)))
345 calibrate
.type
= old_calibrate
.type
;
346 ret
= lttng_calibrate(&calibrate
);
347 if (copy_to_user(ucalibrate
, &old_calibrate
, sizeof(old_calibrate
)))
351 case LTTNG_KERNEL_CALIBRATE
:
353 struct lttng_kernel_calibrate __user
*ucalibrate
=
354 (struct lttng_kernel_calibrate __user
*) arg
;
355 struct lttng_kernel_calibrate calibrate
;
358 if (copy_from_user(&calibrate
, ucalibrate
, sizeof(calibrate
)))
360 ret
= lttng_calibrate(&calibrate
);
361 if (copy_to_user(ucalibrate
, &calibrate
, sizeof(calibrate
)))
370 static const struct file_operations lttng_fops
= {
371 .owner
= THIS_MODULE
,
372 .unlocked_ioctl
= lttng_ioctl
,
374 .compat_ioctl
= lttng_ioctl
,
379 int lttng_abi_create_channel(struct file
*session_file
,
380 struct lttng_kernel_channel
*chan_param
,
381 enum channel_type channel_type
)
383 struct lttng_session
*session
= session_file
->private_data
;
384 const struct file_operations
*fops
= NULL
;
385 const char *transport_name
;
386 struct lttng_channel
*chan
;
387 struct file
*chan_file
;
391 chan_fd
= lttng_get_unused_fd();
396 switch (channel_type
) {
397 case PER_CPU_CHANNEL
:
398 fops
= <tng_channel_fops
;
400 case METADATA_CHANNEL
:
401 fops
= <tng_metadata_fops
;
405 chan_file
= anon_inode_getfile("[lttng_channel]",
408 if (IS_ERR(chan_file
)) {
409 ret
= PTR_ERR(chan_file
);
412 switch (channel_type
) {
413 case PER_CPU_CHANNEL
:
414 if (chan_param
->output
== LTTNG_KERNEL_SPLICE
) {
415 transport_name
= chan_param
->overwrite
?
416 "relay-overwrite" : "relay-discard";
417 } else if (chan_param
->output
== LTTNG_KERNEL_MMAP
) {
418 transport_name
= chan_param
->overwrite
?
419 "relay-overwrite-mmap" : "relay-discard-mmap";
424 case METADATA_CHANNEL
:
425 if (chan_param
->output
== LTTNG_KERNEL_SPLICE
)
426 transport_name
= "relay-metadata";
427 else if (chan_param
->output
== LTTNG_KERNEL_MMAP
)
428 transport_name
= "relay-metadata-mmap";
433 transport_name
= "<unknown>";
436 if (atomic_long_add_unless(&session_file
->f_count
,
437 1, INT_MAX
) == INT_MAX
) {
441 * We tolerate no failure path after channel creation. It will stay
442 * invariant for the rest of the session.
444 chan
= lttng_channel_create(session
, transport_name
, NULL
,
445 chan_param
->subbuf_size
,
446 chan_param
->num_subbuf
,
447 chan_param
->switch_timer_interval
,
448 chan_param
->read_timer_interval
,
454 chan
->file
= chan_file
;
455 chan_file
->private_data
= chan
;
456 fd_install(chan_fd
, chan_file
);
461 atomic_long_dec(&session_file
->f_count
);
465 put_unused_fd(chan_fd
);
471 * lttng_session_ioctl - lttng session fd ioctl
477 * This ioctl implements lttng commands:
478 * LTTNG_KERNEL_CHANNEL
479 * Returns a LTTng channel file descriptor
480 * LTTNG_KERNEL_ENABLE
481 * Enables tracing for a session (weak enable)
482 * LTTNG_KERNEL_DISABLE
483 * Disables tracing for a session (strong disable)
484 * LTTNG_KERNEL_METADATA
485 * Returns a LTTng metadata file descriptor
486 * LTTNG_KERNEL_SESSION_TRACK_PID
487 * Add PID to session tracker
488 * LTTNG_KERNEL_SESSION_UNTRACK_PID
489 * Remove PID from session tracker
491 * The returned channel will be deleted when its file descriptor is closed.
494 long lttng_session_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
496 struct lttng_session
*session
= file
->private_data
;
499 case LTTNG_KERNEL_OLD_CHANNEL
:
501 struct lttng_kernel_channel chan_param
;
502 struct lttng_kernel_old_channel old_chan_param
;
504 if (copy_from_user(&old_chan_param
,
505 (struct lttng_kernel_old_channel __user
*) arg
,
506 sizeof(struct lttng_kernel_old_channel
)))
508 chan_param
.overwrite
= old_chan_param
.overwrite
;
509 chan_param
.subbuf_size
= old_chan_param
.subbuf_size
;
510 chan_param
.num_subbuf
= old_chan_param
.num_subbuf
;
511 chan_param
.switch_timer_interval
= old_chan_param
.switch_timer_interval
;
512 chan_param
.read_timer_interval
= old_chan_param
.read_timer_interval
;
513 chan_param
.output
= old_chan_param
.output
;
515 return lttng_abi_create_channel(file
, &chan_param
,
518 case LTTNG_KERNEL_CHANNEL
:
520 struct lttng_kernel_channel chan_param
;
522 if (copy_from_user(&chan_param
,
523 (struct lttng_kernel_channel __user
*) arg
,
524 sizeof(struct lttng_kernel_channel
)))
526 return lttng_abi_create_channel(file
, &chan_param
,
529 case LTTNG_KERNEL_OLD_SESSION_START
:
530 case LTTNG_KERNEL_OLD_ENABLE
:
531 case LTTNG_KERNEL_SESSION_START
:
532 case LTTNG_KERNEL_ENABLE
:
533 return lttng_session_enable(session
);
534 case LTTNG_KERNEL_OLD_SESSION_STOP
:
535 case LTTNG_KERNEL_OLD_DISABLE
:
536 case LTTNG_KERNEL_SESSION_STOP
:
537 case LTTNG_KERNEL_DISABLE
:
538 return lttng_session_disable(session
);
539 case LTTNG_KERNEL_OLD_METADATA
:
541 struct lttng_kernel_channel chan_param
;
542 struct lttng_kernel_old_channel old_chan_param
;
544 if (copy_from_user(&old_chan_param
,
545 (struct lttng_kernel_old_channel __user
*) arg
,
546 sizeof(struct lttng_kernel_old_channel
)))
548 chan_param
.overwrite
= old_chan_param
.overwrite
;
549 chan_param
.subbuf_size
= old_chan_param
.subbuf_size
;
550 chan_param
.num_subbuf
= old_chan_param
.num_subbuf
;
551 chan_param
.switch_timer_interval
= old_chan_param
.switch_timer_interval
;
552 chan_param
.read_timer_interval
= old_chan_param
.read_timer_interval
;
553 chan_param
.output
= old_chan_param
.output
;
555 return lttng_abi_create_channel(file
, &chan_param
,
558 case LTTNG_KERNEL_METADATA
:
560 struct lttng_kernel_channel chan_param
;
562 if (copy_from_user(&chan_param
,
563 (struct lttng_kernel_channel __user
*) arg
,
564 sizeof(struct lttng_kernel_channel
)))
566 return lttng_abi_create_channel(file
, &chan_param
,
569 case LTTNG_KERNEL_SESSION_TRACK_PID
:
570 return lttng_session_track_pid(session
, (int) arg
);
571 case LTTNG_KERNEL_SESSION_UNTRACK_PID
:
572 return lttng_session_untrack_pid(session
, (int) arg
);
573 case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS
:
574 return lttng_session_list_tracker_pids(session
);
575 case LTTNG_KERNEL_SESSION_METADATA_REGEN
:
576 return lttng_session_metadata_regenerate(session
);
577 case LTTNG_KERNEL_SESSION_STATEDUMP
:
578 return lttng_session_statedump(session
);
585 * Called when the last file reference is dropped.
587 * Big fat note: channels and events are invariant for the whole session after
588 * their creation. So this session destruction also destroys all channel and
589 * event structures specific to this session (they are not destroyed when their
590 * individual file is released).
593 int lttng_session_release(struct inode
*inode
, struct file
*file
)
595 struct lttng_session
*session
= file
->private_data
;
598 lttng_session_destroy(session
);
602 static const struct file_operations lttng_session_fops
= {
603 .owner
= THIS_MODULE
,
604 .release
= lttng_session_release
,
605 .unlocked_ioctl
= lttng_session_ioctl
,
607 .compat_ioctl
= lttng_session_ioctl
,
612 * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation
616 * Handles the poll operations for the metadata channels.
619 unsigned int lttng_metadata_ring_buffer_poll(struct file
*filp
,
622 struct lttng_metadata_stream
*stream
= filp
->private_data
;
623 struct lib_ring_buffer
*buf
= stream
->priv
;
625 unsigned int mask
= 0;
627 if (filp
->f_mode
& FMODE_READ
) {
628 poll_wait_set_exclusive(wait
);
629 poll_wait(filp
, &stream
->read_wait
, wait
);
631 finalized
= stream
->finalized
;
634 * lib_ring_buffer_is_finalized() contains a smp_rmb()
635 * ordering finalized load before offsets loads.
637 WARN_ON(atomic_long_read(&buf
->active_readers
) != 1);
642 mutex_lock(&stream
->metadata_cache
->lock
);
643 if (stream
->metadata_cache
->metadata_written
>
644 stream
->metadata_out
)
646 mutex_unlock(&stream
->metadata_cache
->lock
);
653 void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file
*filp
,
654 unsigned int cmd
, unsigned long arg
)
656 struct lttng_metadata_stream
*stream
= filp
->private_data
;
658 stream
->metadata_out
= stream
->metadata_in
;
662 * Reset the counter of how much metadata has been consumed to 0. That way,
663 * the consumer receives the content of the metadata cache unchanged. This is
664 * different from the metadata_regenerate where the offset from epoch is
665 * resampled, here we want the exact same content as the last time the metadata
666 * was generated. This command is only possible if all the metadata written
667 * in the cache has been output to the metadata stream to avoid corrupting the
670 * Return 0 on success, a negative value on error.
673 int lttng_metadata_cache_dump(struct lttng_metadata_stream
*stream
)
676 struct lttng_metadata_cache
*cache
= stream
->metadata_cache
;
678 mutex_lock(&cache
->lock
);
679 if (stream
->metadata_out
!= cache
->metadata_written
) {
683 stream
->metadata_out
= 0;
684 stream
->metadata_in
= 0;
685 wake_up_interruptible(&stream
->read_wait
);
689 mutex_unlock(&cache
->lock
);
694 long lttng_metadata_ring_buffer_ioctl(struct file
*filp
,
695 unsigned int cmd
, unsigned long arg
)
698 struct lttng_metadata_stream
*stream
= filp
->private_data
;
699 struct lib_ring_buffer
*buf
= stream
->priv
;
702 case RING_BUFFER_GET_NEXT_SUBBUF
:
704 struct lttng_metadata_stream
*stream
= filp
->private_data
;
705 struct lib_ring_buffer
*buf
= stream
->priv
;
706 struct channel
*chan
= buf
->backend
.chan
;
708 ret
= lttng_metadata_output_channel(stream
, chan
);
710 lib_ring_buffer_switch_slow(buf
, SWITCH_ACTIVE
);
716 case RING_BUFFER_GET_SUBBUF
:
719 * Random access is not allowed for metadata channel.
723 case RING_BUFFER_FLUSH_EMPTY
: /* Fall-through. */
724 case RING_BUFFER_FLUSH
:
726 struct lttng_metadata_stream
*stream
= filp
->private_data
;
727 struct lib_ring_buffer
*buf
= stream
->priv
;
728 struct channel
*chan
= buf
->backend
.chan
;
731 * Before doing the actual ring buffer flush, write up to one
732 * packet of metadata in the ring buffer.
734 ret
= lttng_metadata_output_channel(stream
, chan
);
739 case RING_BUFFER_GET_METADATA_VERSION
:
741 struct lttng_metadata_stream
*stream
= filp
->private_data
;
743 return put_u64(stream
->version
, arg
);
745 case RING_BUFFER_METADATA_CACHE_DUMP
:
747 struct lttng_metadata_stream
*stream
= filp
->private_data
;
749 return lttng_metadata_cache_dump(stream
);
754 /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */
756 /* Performing lib ring buffer ioctl after our own. */
757 ret
= lib_ring_buffer_ioctl(filp
, cmd
, arg
, buf
);
762 case RING_BUFFER_PUT_NEXT_SUBBUF
:
764 lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp
,
777 long lttng_metadata_ring_buffer_compat_ioctl(struct file
*filp
,
778 unsigned int cmd
, unsigned long arg
)
781 struct lttng_metadata_stream
*stream
= filp
->private_data
;
782 struct lib_ring_buffer
*buf
= stream
->priv
;
785 case RING_BUFFER_GET_NEXT_SUBBUF
:
787 struct lttng_metadata_stream
*stream
= filp
->private_data
;
788 struct lib_ring_buffer
*buf
= stream
->priv
;
789 struct channel
*chan
= buf
->backend
.chan
;
791 ret
= lttng_metadata_output_channel(stream
, chan
);
793 lib_ring_buffer_switch_slow(buf
, SWITCH_ACTIVE
);
799 case RING_BUFFER_GET_SUBBUF
:
802 * Random access is not allowed for metadata channel.
806 case RING_BUFFER_FLUSH_EMPTY
: /* Fall-through. */
807 case RING_BUFFER_FLUSH
:
809 struct lttng_metadata_stream
*stream
= filp
->private_data
;
810 struct lib_ring_buffer
*buf
= stream
->priv
;
811 struct channel
*chan
= buf
->backend
.chan
;
814 * Before doing the actual ring buffer flush, write up to one
815 * packet of metadata in the ring buffer.
817 ret
= lttng_metadata_output_channel(stream
, chan
);
822 case RING_BUFFER_GET_METADATA_VERSION
:
824 struct lttng_metadata_stream
*stream
= filp
->private_data
;
826 return put_u64(stream
->version
, arg
);
828 case RING_BUFFER_METADATA_CACHE_DUMP
:
830 struct lttng_metadata_stream
*stream
= filp
->private_data
;
832 return lttng_metadata_cache_dump(stream
);
837 /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */
839 /* Performing lib ring buffer ioctl after our own. */
840 ret
= lib_ring_buffer_compat_ioctl(filp
, cmd
, arg
, buf
);
845 case RING_BUFFER_PUT_NEXT_SUBBUF
:
847 lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp
,
860 * This is not used by anonymous file descriptors. This code is left
861 * there if we ever want to implement an inode with open() operation.
864 int lttng_metadata_ring_buffer_open(struct inode
*inode
, struct file
*file
)
866 struct lttng_metadata_stream
*stream
= inode
->i_private
;
867 struct lib_ring_buffer
*buf
= stream
->priv
;
869 file
->private_data
= buf
;
871 * Since life-time of metadata cache differs from that of
872 * session, we need to keep our own reference on the transport.
874 if (!try_module_get(stream
->transport
->owner
)) {
875 printk(KERN_WARNING
"LTT : Can't lock transport module.\n");
878 return lib_ring_buffer_open(inode
, file
, buf
);
882 int lttng_metadata_ring_buffer_release(struct inode
*inode
, struct file
*file
)
884 struct lttng_metadata_stream
*stream
= file
->private_data
;
885 struct lib_ring_buffer
*buf
= stream
->priv
;
887 kref_put(&stream
->metadata_cache
->refcount
, metadata_cache_destroy
);
888 module_put(stream
->transport
->owner
);
889 return lib_ring_buffer_release(inode
, file
, buf
);
893 ssize_t
lttng_metadata_ring_buffer_splice_read(struct file
*in
, loff_t
*ppos
,
894 struct pipe_inode_info
*pipe
, size_t len
,
897 struct lttng_metadata_stream
*stream
= in
->private_data
;
898 struct lib_ring_buffer
*buf
= stream
->priv
;
900 return lib_ring_buffer_splice_read(in
, ppos
, pipe
, len
,
905 int lttng_metadata_ring_buffer_mmap(struct file
*filp
,
906 struct vm_area_struct
*vma
)
908 struct lttng_metadata_stream
*stream
= filp
->private_data
;
909 struct lib_ring_buffer
*buf
= stream
->priv
;
911 return lib_ring_buffer_mmap(filp
, vma
, buf
);
915 const struct file_operations lttng_metadata_ring_buffer_file_operations
= {
916 .owner
= THIS_MODULE
,
917 .open
= lttng_metadata_ring_buffer_open
,
918 .release
= lttng_metadata_ring_buffer_release
,
919 .poll
= lttng_metadata_ring_buffer_poll
,
920 .splice_read
= lttng_metadata_ring_buffer_splice_read
,
921 .mmap
= lttng_metadata_ring_buffer_mmap
,
922 .unlocked_ioctl
= lttng_metadata_ring_buffer_ioctl
,
923 .llseek
= vfs_lib_ring_buffer_no_llseek
,
925 .compat_ioctl
= lttng_metadata_ring_buffer_compat_ioctl
,
930 int lttng_abi_create_stream_fd(struct file
*channel_file
, void *stream_priv
,
931 const struct file_operations
*fops
)
934 struct file
*stream_file
;
936 stream_fd
= lttng_get_unused_fd();
941 stream_file
= anon_inode_getfile("[lttng_stream]", fops
,
942 stream_priv
, O_RDWR
);
943 if (IS_ERR(stream_file
)) {
944 ret
= PTR_ERR(stream_file
);
948 * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor
949 * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this
950 * file descriptor, so we set FMODE_PREAD here.
952 stream_file
->f_mode
|= FMODE_PREAD
;
953 fd_install(stream_fd
, stream_file
);
955 * The stream holds a reference to the channel within the generic ring
956 * buffer library, so no need to hold a refcount on the channel and
957 * session files here.
962 put_unused_fd(stream_fd
);
968 int lttng_abi_open_stream(struct file
*channel_file
)
970 struct lttng_channel
*channel
= channel_file
->private_data
;
971 struct lib_ring_buffer
*buf
;
975 buf
= channel
->ops
->buffer_read_open(channel
->chan
);
980 ret
= lttng_abi_create_stream_fd(channel_file
, stream_priv
,
981 <tng_stream_ring_buffer_file_operations
);
988 channel
->ops
->buffer_read_close(buf
);
993 int lttng_abi_open_metadata_stream(struct file
*channel_file
)
995 struct lttng_channel
*channel
= channel_file
->private_data
;
996 struct lttng_session
*session
= channel
->session
;
997 struct lib_ring_buffer
*buf
;
999 struct lttng_metadata_stream
*metadata_stream
;
1002 buf
= channel
->ops
->buffer_read_open(channel
->chan
);
1006 metadata_stream
= kzalloc(sizeof(struct lttng_metadata_stream
),
1008 if (!metadata_stream
) {
1012 metadata_stream
->metadata_cache
= session
->metadata_cache
;
1013 init_waitqueue_head(&metadata_stream
->read_wait
);
1014 metadata_stream
->priv
= buf
;
1015 stream_priv
= metadata_stream
;
1016 metadata_stream
->transport
= channel
->transport
;
1019 * Since life-time of metadata cache differs from that of
1020 * session, we need to keep our own reference on the transport.
1022 if (!try_module_get(metadata_stream
->transport
->owner
)) {
1023 printk(KERN_WARNING
"LTT : Can't lock transport module.\n");
1028 if (!lttng_kref_get(&session
->metadata_cache
->refcount
)) {
1033 ret
= lttng_abi_create_stream_fd(channel_file
, stream_priv
,
1034 <tng_metadata_ring_buffer_file_operations
);
1038 list_add(&metadata_stream
->list
,
1039 &session
->metadata_cache
->metadata_stream
);
1043 kref_put(&session
->metadata_cache
->refcount
, metadata_cache_destroy
);
1045 module_put(metadata_stream
->transport
->owner
);
1047 kfree(metadata_stream
);
1049 channel
->ops
->buffer_read_close(buf
);
1054 int lttng_abi_create_event(struct file
*channel_file
,
1055 struct lttng_kernel_event
*event_param
)
1057 struct lttng_channel
*channel
= channel_file
->private_data
;
1059 struct file
*event_file
;
1062 event_param
->name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1063 switch (event_param
->instrumentation
) {
1064 case LTTNG_KERNEL_KRETPROBE
:
1065 event_param
->u
.kretprobe
.symbol_name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1067 case LTTNG_KERNEL_KPROBE
:
1068 event_param
->u
.kprobe
.symbol_name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1070 case LTTNG_KERNEL_FUNCTION
:
1071 event_param
->u
.ftrace
.symbol_name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
1076 event_fd
= lttng_get_unused_fd();
1081 event_file
= anon_inode_getfile("[lttng_event]",
1084 if (IS_ERR(event_file
)) {
1085 ret
= PTR_ERR(event_file
);
1088 /* The event holds a reference on the channel */
1089 if (atomic_long_add_unless(&channel_file
->f_count
,
1090 1, INT_MAX
) == INT_MAX
) {
1092 goto refcount_error
;
1094 if (event_param
->instrumentation
== LTTNG_KERNEL_TRACEPOINT
1095 || event_param
->instrumentation
== LTTNG_KERNEL_SYSCALL
) {
1096 struct lttng_enabler
*enabler
;
1098 if (strutils_is_star_glob_pattern(event_param
->name
)) {
1100 * If the event name is a star globbing pattern,
1101 * we create the special star globbing enabler.
1103 enabler
= lttng_enabler_create(LTTNG_ENABLER_STAR_GLOB
,
1104 event_param
, channel
);
1106 enabler
= lttng_enabler_create(LTTNG_ENABLER_NAME
,
1107 event_param
, channel
);
1111 struct lttng_event
*event
;
1114 * We tolerate no failure path after event creation. It
1115 * will stay invariant for the rest of the session.
1117 event
= lttng_event_create(channel
, event_param
,
1119 event_param
->instrumentation
);
1120 WARN_ON_ONCE(!event
);
1121 if (IS_ERR(event
)) {
1122 ret
= PTR_ERR(event
);
1127 event_file
->private_data
= priv
;
1128 fd_install(event_fd
, event_file
);
1132 atomic_long_dec(&channel_file
->f_count
);
1136 put_unused_fd(event_fd
);
1142 * lttng_channel_ioctl - lttng syscall through ioctl
1148 * This ioctl implements lttng commands:
1149 * LTTNG_KERNEL_STREAM
1150 * Returns an event stream file descriptor or failure.
1151 * (typically, one event stream records events from one CPU)
1152 * LTTNG_KERNEL_EVENT
1153 * Returns an event file descriptor or failure.
1154 * LTTNG_KERNEL_CONTEXT
1155 * Prepend a context field to each event in the channel
1156 * LTTNG_KERNEL_ENABLE
1157 * Enable recording for events in this channel (weak enable)
1158 * LTTNG_KERNEL_DISABLE
1159 * Disable recording for events in this channel (strong disable)
1161 * Channel and event file descriptors also hold a reference on the session.
1164 long lttng_channel_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1166 struct lttng_channel
*channel
= file
->private_data
;
1169 case LTTNG_KERNEL_OLD_STREAM
:
1170 case LTTNG_KERNEL_STREAM
:
1171 return lttng_abi_open_stream(file
);
1172 case LTTNG_KERNEL_OLD_EVENT
:
1174 struct lttng_kernel_event
*uevent_param
;
1175 struct lttng_kernel_old_event
*old_uevent_param
;
1178 uevent_param
= kmalloc(sizeof(struct lttng_kernel_event
),
1180 if (!uevent_param
) {
1184 old_uevent_param
= kmalloc(
1185 sizeof(struct lttng_kernel_old_event
),
1187 if (!old_uevent_param
) {
1189 goto old_event_error_free_param
;
1191 if (copy_from_user(old_uevent_param
,
1192 (struct lttng_kernel_old_event __user
*) arg
,
1193 sizeof(struct lttng_kernel_old_event
))) {
1195 goto old_event_error_free_old_param
;
1198 memcpy(uevent_param
->name
, old_uevent_param
->name
,
1199 sizeof(uevent_param
->name
));
1200 uevent_param
->instrumentation
=
1201 old_uevent_param
->instrumentation
;
1203 switch (old_uevent_param
->instrumentation
) {
1204 case LTTNG_KERNEL_KPROBE
:
1205 uevent_param
->u
.kprobe
.addr
=
1206 old_uevent_param
->u
.kprobe
.addr
;
1207 uevent_param
->u
.kprobe
.offset
=
1208 old_uevent_param
->u
.kprobe
.offset
;
1209 memcpy(uevent_param
->u
.kprobe
.symbol_name
,
1210 old_uevent_param
->u
.kprobe
.symbol_name
,
1211 sizeof(uevent_param
->u
.kprobe
.symbol_name
));
1213 case LTTNG_KERNEL_KRETPROBE
:
1214 uevent_param
->u
.kretprobe
.addr
=
1215 old_uevent_param
->u
.kretprobe
.addr
;
1216 uevent_param
->u
.kretprobe
.offset
=
1217 old_uevent_param
->u
.kretprobe
.offset
;
1218 memcpy(uevent_param
->u
.kretprobe
.symbol_name
,
1219 old_uevent_param
->u
.kretprobe
.symbol_name
,
1220 sizeof(uevent_param
->u
.kretprobe
.symbol_name
));
1222 case LTTNG_KERNEL_FUNCTION
:
1223 memcpy(uevent_param
->u
.ftrace
.symbol_name
,
1224 old_uevent_param
->u
.ftrace
.symbol_name
,
1225 sizeof(uevent_param
->u
.ftrace
.symbol_name
));
1230 ret
= lttng_abi_create_event(file
, uevent_param
);
1232 old_event_error_free_old_param
:
1233 kfree(old_uevent_param
);
1234 old_event_error_free_param
:
1235 kfree(uevent_param
);
1239 case LTTNG_KERNEL_EVENT
:
1241 struct lttng_kernel_event uevent_param
;
1243 if (copy_from_user(&uevent_param
,
1244 (struct lttng_kernel_event __user
*) arg
,
1245 sizeof(uevent_param
)))
1247 return lttng_abi_create_event(file
, &uevent_param
);
1249 case LTTNG_KERNEL_OLD_CONTEXT
:
1251 struct lttng_kernel_context
*ucontext_param
;
1252 struct lttng_kernel_old_context
*old_ucontext_param
;
1255 ucontext_param
= kmalloc(sizeof(struct lttng_kernel_context
),
1257 if (!ucontext_param
) {
1261 old_ucontext_param
= kmalloc(sizeof(struct lttng_kernel_old_context
),
1263 if (!old_ucontext_param
) {
1265 goto old_ctx_error_free_param
;
1268 if (copy_from_user(old_ucontext_param
,
1269 (struct lttng_kernel_old_context __user
*) arg
,
1270 sizeof(struct lttng_kernel_old_context
))) {
1272 goto old_ctx_error_free_old_param
;
1274 ucontext_param
->ctx
= old_ucontext_param
->ctx
;
1275 memcpy(ucontext_param
->padding
, old_ucontext_param
->padding
,
1276 sizeof(ucontext_param
->padding
));
1277 /* only type that uses the union */
1278 if (old_ucontext_param
->ctx
== LTTNG_KERNEL_CONTEXT_PERF_COUNTER
) {
1279 ucontext_param
->u
.perf_counter
.type
=
1280 old_ucontext_param
->u
.perf_counter
.type
;
1281 ucontext_param
->u
.perf_counter
.config
=
1282 old_ucontext_param
->u
.perf_counter
.config
;
1283 memcpy(ucontext_param
->u
.perf_counter
.name
,
1284 old_ucontext_param
->u
.perf_counter
.name
,
1285 sizeof(ucontext_param
->u
.perf_counter
.name
));
1288 ret
= lttng_abi_add_context(file
,
1290 &channel
->ctx
, channel
->session
);
1292 old_ctx_error_free_old_param
:
1293 kfree(old_ucontext_param
);
1294 old_ctx_error_free_param
:
1295 kfree(ucontext_param
);
1299 case LTTNG_KERNEL_CONTEXT
:
1301 struct lttng_kernel_context ucontext_param
;
1303 if (copy_from_user(&ucontext_param
,
1304 (struct lttng_kernel_context __user
*) arg
,
1305 sizeof(ucontext_param
)))
1307 return lttng_abi_add_context(file
,
1309 &channel
->ctx
, channel
->session
);
1311 case LTTNG_KERNEL_OLD_ENABLE
:
1312 case LTTNG_KERNEL_ENABLE
:
1313 return lttng_channel_enable(channel
);
1314 case LTTNG_KERNEL_OLD_DISABLE
:
1315 case LTTNG_KERNEL_DISABLE
:
1316 return lttng_channel_disable(channel
);
1317 case LTTNG_KERNEL_SYSCALL_MASK
:
1318 return lttng_channel_syscall_mask(channel
,
1319 (struct lttng_kernel_syscall_mask __user
*) arg
);
1321 return -ENOIOCTLCMD
;
1327 * lttng_metadata_ioctl - lttng syscall through ioctl
1333 * This ioctl implements lttng commands:
1334 * LTTNG_KERNEL_STREAM
1335 * Returns an event stream file descriptor or failure.
1337 * Channel and event file descriptors also hold a reference on the session.
1340 long lttng_metadata_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1343 case LTTNG_KERNEL_OLD_STREAM
:
1344 case LTTNG_KERNEL_STREAM
:
1345 return lttng_abi_open_metadata_stream(file
);
1347 return -ENOIOCTLCMD
;
1352 * lttng_channel_poll - lttng stream addition/removal monitoring
1357 unsigned int lttng_channel_poll(struct file
*file
, poll_table
*wait
)
1359 struct lttng_channel
*channel
= file
->private_data
;
1360 unsigned int mask
= 0;
1362 if (file
->f_mode
& FMODE_READ
) {
1363 poll_wait_set_exclusive(wait
);
1364 poll_wait(file
, channel
->ops
->get_hp_wait_queue(channel
->chan
),
1367 if (channel
->ops
->is_disabled(channel
->chan
))
1369 if (channel
->ops
->is_finalized(channel
->chan
))
1371 if (channel
->ops
->buffer_has_read_closed_stream(channel
->chan
))
1372 return POLLIN
| POLLRDNORM
;
1380 int lttng_channel_release(struct inode
*inode
, struct file
*file
)
1382 struct lttng_channel
*channel
= file
->private_data
;
1385 fput(channel
->session
->file
);
1390 int lttng_metadata_channel_release(struct inode
*inode
, struct file
*file
)
1392 struct lttng_channel
*channel
= file
->private_data
;
1395 fput(channel
->session
->file
);
1396 lttng_metadata_channel_destroy(channel
);
1402 static const struct file_operations lttng_channel_fops
= {
1403 .owner
= THIS_MODULE
,
1404 .release
= lttng_channel_release
,
1405 .poll
= lttng_channel_poll
,
1406 .unlocked_ioctl
= lttng_channel_ioctl
,
1407 #ifdef CONFIG_COMPAT
1408 .compat_ioctl
= lttng_channel_ioctl
,
1412 static const struct file_operations lttng_metadata_fops
= {
1413 .owner
= THIS_MODULE
,
1414 .release
= lttng_metadata_channel_release
,
1415 .unlocked_ioctl
= lttng_metadata_ioctl
,
1416 #ifdef CONFIG_COMPAT
1417 .compat_ioctl
= lttng_metadata_ioctl
,
1422 * lttng_event_ioctl - lttng syscall through ioctl
1428 * This ioctl implements lttng commands:
1429 * LTTNG_KERNEL_CONTEXT
1430 * Prepend a context field to each record of this event
1431 * LTTNG_KERNEL_ENABLE
1432 * Enable recording for this event (weak enable)
1433 * LTTNG_KERNEL_DISABLE
1434 * Disable recording for this event (strong disable)
1437 long lttng_event_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1439 struct lttng_event
*event
;
1440 struct lttng_enabler
*enabler
;
1441 enum lttng_event_type
*evtype
= file
->private_data
;
1444 case LTTNG_KERNEL_OLD_CONTEXT
:
1446 /* Not implemented */
1449 case LTTNG_KERNEL_CONTEXT
:
1451 /* Not implemented */
1454 case LTTNG_KERNEL_OLD_ENABLE
:
1455 case LTTNG_KERNEL_ENABLE
:
1457 case LTTNG_TYPE_EVENT
:
1458 event
= file
->private_data
;
1459 return lttng_event_enable(event
);
1460 case LTTNG_TYPE_ENABLER
:
1461 enabler
= file
->private_data
;
1462 return lttng_enabler_enable(enabler
);
1467 case LTTNG_KERNEL_OLD_DISABLE
:
1468 case LTTNG_KERNEL_DISABLE
:
1470 case LTTNG_TYPE_EVENT
:
1471 event
= file
->private_data
;
1472 return lttng_event_disable(event
);
1473 case LTTNG_TYPE_ENABLER
:
1474 enabler
= file
->private_data
;
1475 return lttng_enabler_disable(enabler
);
1480 case LTTNG_KERNEL_FILTER
:
1482 case LTTNG_TYPE_EVENT
:
1484 case LTTNG_TYPE_ENABLER
:
1486 enabler
= file
->private_data
;
1487 return lttng_enabler_attach_bytecode(enabler
,
1488 (struct lttng_kernel_filter_bytecode __user
*) arg
);
1493 return -ENOIOCTLCMD
;
1498 int lttng_event_release(struct inode
*inode
, struct file
*file
)
1500 struct lttng_event
*event
;
1501 struct lttng_enabler
*enabler
;
1502 enum lttng_event_type
*evtype
= file
->private_data
;
1508 case LTTNG_TYPE_EVENT
:
1509 event
= file
->private_data
;
1511 fput(event
->chan
->file
);
1513 case LTTNG_TYPE_ENABLER
:
1514 enabler
= file
->private_data
;
1516 fput(enabler
->chan
->file
);
1526 /* TODO: filter control ioctl */
1527 static const struct file_operations lttng_event_fops
= {
1528 .owner
= THIS_MODULE
,
1529 .release
= lttng_event_release
,
1530 .unlocked_ioctl
= lttng_event_ioctl
,
1531 #ifdef CONFIG_COMPAT
1532 .compat_ioctl
= lttng_event_ioctl
,
1536 static int put_u64(uint64_t val
, unsigned long arg
)
1538 return put_user(val
, (uint64_t __user
*) arg
);
1541 static long lttng_stream_ring_buffer_ioctl(struct file
*filp
,
1542 unsigned int cmd
, unsigned long arg
)
1544 struct lib_ring_buffer
*buf
= filp
->private_data
;
1545 struct channel
*chan
= buf
->backend
.chan
;
1546 const struct lib_ring_buffer_config
*config
= &chan
->backend
.config
;
1547 const struct lttng_channel_ops
*ops
= chan
->backend
.priv_ops
;
1550 if (atomic_read(&chan
->record_disabled
))
1554 case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN
:
1558 ret
= ops
->timestamp_begin(config
, buf
, &ts
);
1561 return put_u64(ts
, arg
);
1563 case LTTNG_RING_BUFFER_GET_TIMESTAMP_END
:
1567 ret
= ops
->timestamp_end(config
, buf
, &ts
);
1570 return put_u64(ts
, arg
);
1572 case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED
:
1576 ret
= ops
->events_discarded(config
, buf
, &ed
);
1579 return put_u64(ed
, arg
);
1581 case LTTNG_RING_BUFFER_GET_CONTENT_SIZE
:
1585 ret
= ops
->content_size(config
, buf
, &cs
);
1588 return put_u64(cs
, arg
);
1590 case LTTNG_RING_BUFFER_GET_PACKET_SIZE
:
1594 ret
= ops
->packet_size(config
, buf
, &ps
);
1597 return put_u64(ps
, arg
);
1599 case LTTNG_RING_BUFFER_GET_STREAM_ID
:
1603 ret
= ops
->stream_id(config
, buf
, &si
);
1606 return put_u64(si
, arg
);
1608 case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP
:
1612 ret
= ops
->current_timestamp(config
, buf
, &ts
);
1615 return put_u64(ts
, arg
);
1617 case LTTNG_RING_BUFFER_GET_SEQ_NUM
:
1621 ret
= ops
->sequence_number(config
, buf
, &seq
);
1624 return put_u64(seq
, arg
);
1626 case LTTNG_RING_BUFFER_INSTANCE_ID
:
1630 ret
= ops
->instance_id(config
, buf
, &id
);
1633 return put_u64(id
, arg
);
1636 return lib_ring_buffer_file_operations
.unlocked_ioctl(filp
,
1644 #ifdef CONFIG_COMPAT
1645 static long lttng_stream_ring_buffer_compat_ioctl(struct file
*filp
,
1646 unsigned int cmd
, unsigned long arg
)
1648 struct lib_ring_buffer
*buf
= filp
->private_data
;
1649 struct channel
*chan
= buf
->backend
.chan
;
1650 const struct lib_ring_buffer_config
*config
= &chan
->backend
.config
;
1651 const struct lttng_channel_ops
*ops
= chan
->backend
.priv_ops
;
1654 if (atomic_read(&chan
->record_disabled
))
1658 case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN
:
1662 ret
= ops
->timestamp_begin(config
, buf
, &ts
);
1665 return put_u64(ts
, arg
);
1667 case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END
:
1671 ret
= ops
->timestamp_end(config
, buf
, &ts
);
1674 return put_u64(ts
, arg
);
1676 case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED
:
1680 ret
= ops
->events_discarded(config
, buf
, &ed
);
1683 return put_u64(ed
, arg
);
1685 case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE
:
1689 ret
= ops
->content_size(config
, buf
, &cs
);
1692 return put_u64(cs
, arg
);
1694 case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE
:
1698 ret
= ops
->packet_size(config
, buf
, &ps
);
1701 return put_u64(ps
, arg
);
1703 case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID
:
1707 ret
= ops
->stream_id(config
, buf
, &si
);
1710 return put_u64(si
, arg
);
1712 case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP
:
1716 ret
= ops
->current_timestamp(config
, buf
, &ts
);
1719 return put_u64(ts
, arg
);
1721 case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM
:
1725 ret
= ops
->sequence_number(config
, buf
, &seq
);
1728 return put_u64(seq
, arg
);
1730 case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID
:
1734 ret
= ops
->instance_id(config
, buf
, &id
);
1737 return put_u64(id
, arg
);
1740 return lib_ring_buffer_file_operations
.compat_ioctl(filp
,
1747 #endif /* CONFIG_COMPAT */
1749 static void lttng_stream_override_ring_buffer_fops(void)
1751 lttng_stream_ring_buffer_file_operations
.owner
= THIS_MODULE
;
1752 lttng_stream_ring_buffer_file_operations
.open
=
1753 lib_ring_buffer_file_operations
.open
;
1754 lttng_stream_ring_buffer_file_operations
.release
=
1755 lib_ring_buffer_file_operations
.release
;
1756 lttng_stream_ring_buffer_file_operations
.poll
=
1757 lib_ring_buffer_file_operations
.poll
;
1758 lttng_stream_ring_buffer_file_operations
.splice_read
=
1759 lib_ring_buffer_file_operations
.splice_read
;
1760 lttng_stream_ring_buffer_file_operations
.mmap
=
1761 lib_ring_buffer_file_operations
.mmap
;
1762 lttng_stream_ring_buffer_file_operations
.unlocked_ioctl
=
1763 lttng_stream_ring_buffer_ioctl
;
1764 lttng_stream_ring_buffer_file_operations
.llseek
=
1765 lib_ring_buffer_file_operations
.llseek
;
1766 #ifdef CONFIG_COMPAT
1767 lttng_stream_ring_buffer_file_operations
.compat_ioctl
=
1768 lttng_stream_ring_buffer_compat_ioctl
;
1772 int __init
lttng_abi_init(void)
1776 wrapper_vmalloc_sync_all();
1779 ret
= lttng_tp_mempool_init();
1784 lttng_proc_dentry
= proc_create_data("lttng", S_IRUSR
| S_IWUSR
, NULL
,
1787 if (!lttng_proc_dentry
) {
1788 printk(KERN_ERR
"Error creating LTTng control file\n");
1792 lttng_stream_override_ring_buffer_fops();
1796 lttng_tp_mempool_destroy();
1797 lttng_clock_unref();
1801 /* No __exit annotation because used by init error path too. */
1802 void lttng_abi_exit(void)
1804 lttng_tp_mempool_destroy();
1805 lttng_clock_unref();
1806 if (lttng_proc_dentry
)
1807 remove_proc_entry("lttng", NULL
);